$stageWidth: 640px !default;
$stageHeight: 400px !default;

.container {
  position: relative;
  width: 100%;
  height: 100%;
  background-color: #000;
}

.stage {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  margin: auto;
  width: $stageWidth;
  height: $stageHeight;
  opacity: 0;
  transition: opacity .26s ease-in;

  &.in {
    opacity: 1;
  }
}
